fix(prettier): honor .prettierignore during checks

[davehenton]

Summary

• run the Prettier plugin from the staged repo root so Prettier discovers .prettierignore correctly
• include .gitignore in the plugin cache-affecting files to preserve Prettier's default ignore behavior
• add a regression test covering an ignored file alongside a non-ignored unformatted file

Testing

• cargo test -p qlty network_tests -- --ignored

Fixes #2499

[claude]

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[qltysh]

Coverage Impact - ubuntu-latest

⬆️ Merging this pull request will increase total coverage on main by 0.05%.

Modified Files with Diff Coverage (2)

Rating	File	% Diff	Uncovered Line #s
	qlty-check/src/cache.rs	100.0%
	qlty-check/src/executor/invocation_script.rs	99.3%	149
	Total	99.3%

🤖 Increase coverage with AI coding...

In the `codex/honor-prettierignore` branch, add test coverage for this new code:

- `qlty-check/src/executor/invocation_script.rs` -- Line 149

🚦 See full report on Qlty Cloud »

🛟 Help

• Diff Coverage: Coverage for added or modified lines of code (excludes deleted files). Learn more.

• Total Coverage: Coverage for the whole repository, calculated as the sum of all File Coverage. Learn more.

• File Coverage: Covered Lines divided by Covered Lines plus Missed Lines. (Excludes non-executable lines including blank lines and comments.)

  • Indirect Changes: Changes to File Coverage for files that were not modified in this PR. Learn more.

[qltysh]

Coverage Impact - macos-15

⬆️ Merging this pull request will increase total coverage on main by 0.05%.

Modified Files with Diff Coverage (2)

Rating	File	% Diff	Uncovered Line #s
	qlty-check/src/cache.rs	100.0%
	qlty-check/src/executor/invocation_script.rs	99.3%	149
	Total	99.3%

🤖 Increase coverage with AI coding...

In the `codex/honor-prettierignore` branch, add test coverage for this new code:

- `qlty-check/src/executor/invocation_script.rs` -- Line 149

🚦 See full report on Qlty Cloud »

🛟 Help

• Diff Coverage: Coverage for added or modified lines of code (excludes deleted files). Learn more.

• Total Coverage: Coverage for the whole repository, calculated as the sum of all File Coverage. Learn more.

• File Coverage: Covered Lines divided by Covered Lines plus Missed Lines. (Excludes non-executable lines including blank lines and comments.)

  • Indirect Changes: Changes to File Coverage for files that were not modified in this PR. Learn more.

[isikyus]

This is affecting my current project — is there anything I could do to help get it merged?

For now, my workaround is to run prettier on the excluded lockfiles explicitly (pnpm ones, in my case). I'm hoping this will make the warning go away until I next update them.